Abstract：In order to meet the special requirements of stability，compactness and capacity of high water pressure，a new concept of composite grouting，adopting composite material and process to form a functional composite structure and further to realize the dual effect of safety control and efficient water plugging，was proposed. A diffusion model of slurry vein was established，and the spatial distribution characteristics of the grouting range and the thickness of slurry vein and the influencing factors were revealed. A mechanical model of slurry vein skeleton and composite shell for evaluating the stability of the grouted region was established，and a determining method of macro-mechanical parameters was proposed. The main influencing factors of mechanical properties of the grouted region were analyzed，and a design method of grouting parameters was put forward. As a result，the whole process control of composite grouting can be realized. Based on the feature of composite grouting body functional structure，a technology of peripheral curtain grouting of tunnels was developed，and the water plugging rate，grouting region strength and overall stability were proposed as the evaluation indices of grouting effect. Compared with the full-sectional grouting method，the efficiency and reliability of the developed technology are significantly improved. Finally，the application of the composite grouting technique in the highly permeable area of F1 weathering trough of Xiang'an subsea tunnel in Xiamen was introduced，and it is shown that，by using the technology，the expected effect is achieved and the engineering safety is ensured.
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2019, Vol. 38 
